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2003 Cadillac DeVille 4.6L Poor Idle Quality, Misfire, MIL Lamp on
Posted to GM Driveability on 1/23/2018 9 Replies

flushed fuel tank and lines replaced all injectors fuel filter, coil packs new ac delco plugs and boots, new plenum gasket and boot from throttle body to plenum, car has a steady misfire on cyl 7 and occasional on cyl 8. have checked and rechecked and at a los...

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  Related Documents & Media  2003 Cadillac DeVille

 
Message Closed w/Summary

car Vehicle Data

2003 Cadillac DeVille

VIN 1G6KD54Y63
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, Misfire, MIL Lamp On
OccursAlways

Trouble Codes

P0300Multiple Misfire Detected
Message Closed w/Summary

car Vehicle Data

2003 Cadillac DeVille

VIN 1G6KD54Y63
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, Misfire, MIL Lamp On
OccursAlways

Trouble Codes

P0300Multiple Misfire Detected